Narrowing device for flat knitting machines



Feb. 17, 1942. mHTER 4 2,273,285

NARROWING DEVICE FOR FLAT KNITTING MACHINES Filed May 31, 1941 3 Sheets- Sheet l 32015 Richie)" Feb. 17, 1942. G. RICHTER 2,273,285

NARROWING DEVICE FOR FLAT KNITTING MACHINES Filed May 51, 1941 3 Sheets-Sheet 2 WM mi? Feb. 17, 1942.

G. RICHTER 2,273,285

NARROWING DEVICE FOR FLAT KNITTING MACHINES Filed May 51, 1941 5 Sheets-Sheet 3 9 fiy5 II -n I :1 L ":Lf L

a Z :4 2 /5 f 1 g, y E j Ebb-IL 7/ i 7 +1 5 I09 I 1/ m .r i I L E f L d y I device for flat knitting be1l crank levers mounted in the left,

Patented Feb. 17, 1942 NARROWING DEVICE FOR.

" MACHINES FLAT KNITTING Georg Richter, Chemnitz, Germany Application May 31, 1941, Serial No. 396,135 In Germany May 30, 1940 4 Claims.

(Granted under the provisions March 2, 1927; 357 O- G.

The present invention relates to a narrowing machines of the Cotton type and more particularly is concerned with a fiat knitting machine having a jacquard attachment.

One of the known narrowing devices, serving control purposes, has a great drawback in so far as at higher speeds the narrowing rollers, due to the required displacements, are subjected to the of breakage is liable to occur. I

In accordance with the present invention this drawback is removed by holding, with the aid of a safety or locking device, a narrowing roller, scanning thenarrowing cams, in. any selected position against lateral displacement. The safety or locking device consists of a lever provided with a bolt and connected to the roller shifting fork, and the range of this lever which are arranged one abovethe other and have stepped recesses. These bell crank levers are kinematically connected to said lever. On adjustment of the roller shifting fork, simultaneously the lever and therewith the bolt as well as the bell crank levers are adjusted in such a manner that the stepped recesses surround the bolt in any selected position and thereby lock the narrowing rollers in the selected position. Connected to the bell crank leversare tension springs the other ends of which are fixed to'the machine frame. These springs withdraw the bell crank levers into their starting position after locking has been effected.

In the accompanying drawings one construction according to the present invention is shown by way of example.

In these drawings:

Fig. 1 is a front elevation of portion of a safety or locking device according to the invention,

Fig. 21s the plan view of the device shown in Fig. lin an. enlarged illustration,

Fig. 3 is a side elevation of the device shown in Fig. 1 also in an enlarged illustration,

Fig. 4 is a view showing the narrowing rollers in the position for blind narrowing,

Fig. 5 is a. view showing the position of the narrowing rollers for a one needle rack towards the right,

Fig. 6 is aview showing the position of the narrowing rollers for a Fig. 7 is a view showing the position of the narrowing rollers for a two needle rack towards the right, and

one needle rack towards of 'a connecting rod IS. The

of sec. 14, act of showing the position of the narrowing rollers for a two needle rack towards the left.

In agreement with the twofold divided narrow- Fig. 8 is a view ing device, the arrangement is present in duplicate, *as may be seen from the drawings.

To explain, the arrangement only the device of the one portion is described, as this device in the second portion is identical with that of the first portion.

Mounted upon the cam shaft I are narrowing cams 2, 3, 4, 5 and 6 which, in a well known manner, may be scanned bynarrowing rollers 1 and 8. The narrowing roller 1 is rigidly fixed upon a bolt 9 of a lever l0, whereas the narrowing roller '8 may be displaced upon the bolt 9 by means of a roller shifting fork The lever I0 transmits the movements of the cams upon a stepped wedge not shown in the drawings which in turn displaces the narrowing points also not shown in the drawings.

The roller shifting fork II is fixed upon a bolt l2 which in turn carries a link member l3 mounted upon a vertical shaft 4. The latter is pivotally arranged in the machine frame and carries a lever l5 which may be influenced in the direction of the arrow r shown latter cooperates with a lever l8 pivoted upon a vertical shaft Fixed to the lever I 8 is a bolt l9.

Upon another vertical shaft 20, mounted in the machine frame, bell crank levers 2|, 22; 23, 24; 25, 26 and 21, 28 are pivotally arranged one above the other. The longer lever arms 2|, 23, 25, 21 of these bell crank levers are provided with stepped recesses 29, 30, 3|, 32 respectively which may be swung into the range of the bolt I9, whereas the short lever arms 22, 24, 26, 28 are connected by means of springs 33, 34, 35, 36 respectively to connecting rods 31, 38, 39, respectively which may be influenced in the direction of the arrow 1/ shown in Fig. 2. The lever arms 2|, '23, 25, 21 are actuated by springs 4| fixed to the machineframe. The rod l6 as well as the rods 37., 38, 39 and 40 are kinematically connected and may be influenced by a jacquard device.

As has already been mentioned, the described arrangement is present in duplicate in accordance with the twofold divided narrowing device. The arrangement, of course, may be correspondingly altered in case of another division of the narrowing device.

The operation of the device is as follows: By operating in the directions of the arrows in Fig. 2 by means vice. On the other .hand, the

the connecting rod 16 and the connecting rods 31, 38, 39, 40 kinemati'cally connected thereto, the shaft M on the one hand is turned by way of the lever l5 and therewith an adjustment of the roller shifting fork H, by way of the link member I3, is effected which fork ii adjusts its narrowing roller 8 to the corresponding cam-and transmits the scanned cam movements upon the lever Ill and, therefore, upon the narrowing decorresponding bell crank lever is turned in such a manner that its recess surrounds the bolt l9 and thereby locks the connecting rod l6, the lever 55, the shaft ll, the link-member l3 and the roller shiftin fork i I with its narrowing roller 8 in the selected position.

In Fig. 2 the bell crank lever 25, 22 has been operated, whereby the narrowing roller 8 has been brought into the range of the cam d by means of the connecting rod is. The recess 29 of this bell crank lever surrounds the bolt IQ of the lever l8 and thereby locks the position of the narrowing roller 8.

After the narrowing operation has been efiected during which the connecting rods are released, the bell crank lever returns into its position of rest by the action of its tension spring M and a new narrowing position may be adjusted.

Due to locking the roller rack positions a narrowing operation free of objection is ensured even with the highest speeds.

From Figs. 4 to 8 it may be seen that the narrowing roller I always occupies a position in the path of the narrowing cam 2, whereas the narrowing roller 8 may be brought into the path of the cams 3, 4, 5, 6 or may be moved totally out of their path according to the rack to be effected.

What I claim is:

l. A narrowing device for flat knitting machines of the cotton type provided with a jacquard attachment, comprising narrowing cams, narrowing rollers scanning said cams, one of said rollers being rigidly fixed upon a bolt of a lever and the other of said rollers being displaceably arranged upon said bolt of said lever, and a locking device for automatically locking against lateral movement said displaceable narrowing roller in any selected position.

2. A narrowing device for flat knitting machines of the cotton type provided with a jacquard attachment, comprising narrowing cams, narrowing rollers scanning said cams, one of said rollers being rigidly fixed upon a bolt of a lever and the other of said rollers being displaceably arranged upon said bolt of. said lever, and a locking device for automatically locking against lateral movement said displaceable narrowing roller in any selected position, said lock ing device consisting of a lever connected to a fork, adapted to shift said movably arranged narrowing roller, and provided with a bolt, and of bell crank levers mounted one above the other in the range of said lever and provided with stepped recesses, said bell crank levers being kinematically connected to said lever.

3. A narrowing device as set forth in claim 2 in which with an adjustment of said roller shifts ing fork simultaneously said lever and therewith said bolt as well as said bell crank levers are shifted in such a manner that said stepped recesses surround said bolt in any selected position and therewith lock said narrowing rollers in position.

A narrowing device as set forth in claim 2 in which tension springs, fixed to the machine frame, are connected to said bell crank levers, said springs being adapted to withdraw said bell crank levers into their starting position after looking has been efiected.

GEORG RICHTER. 

